Due to my father's illness,please excuse me to look after him in the hospital for two days from 13th to 15th.I promise to catch up the work I've missed in these days. Thank you Best regards XXXXX
Dear Sir: I am going to take care of my father in hospital from january 13 to 15. Please grant my leave of absence for the above days.I will handle the work as soon as I come back. 签名